I haven't been impressed with the Lightfields. Quite a few of my hunting buddies use them and for the life of me I can't figure out why. They are large slow loads and I don't see where they can compare to a 1900 feet per second premium slug. One shot kills are rare for my friends who use the Lightfields. I suspect the problem might be just what you pointed out about bullet break up. I have 4 boxes of the Winnie Gold Partitions left butI plan on trying the Federal Barnes product on the range this summer to see how they fly.